Strip feeding device



June 19, 1956 J. A. SCHMIDT STRIP FEEDING DEVICE 8 Sheets-Sheet 1 Filed NOV. 13, 1951 INVENTOR JOHN A. SCHM/DT 3m 0 ATTO NEY 8 Sheets-Sheet 2 Filed Nov. 13, 1951 LN 0 m AT v 4 m wm m 5 m2 1 NH I WFE TWMMWMN! QVJQMVWWMOT I 9 H u |1111|L $9 6 E D. m 3 m: M p S M .mi 2: w! mw s w? m 2 7 mm: -N m H S 5 N I: 2V 2 vw 3 h 8 x mm x.

mm L] 9 N5 FF 2 INVENTOR JOHN A. SCHM/DT June 19, 1956 J. A. SCHMIDT STRIP FEEDING DEVICE 8 Sheets-Sheet 3 Filed NOV. 13, 1951 INVENTOR JOHN A. SCHMIDT B U 5pm. WM ATTO NEY June 19, 1956 J. A. SCHMIDT STRIP FEEDING DEVICE 8 Sheets-Sheet 4 Filed Nov. 15, 1951 INVENTOR JOHN A. SCHMIDT 3mm ATT RNEY June 19, 1956 J. A. SCHMIDT 2,751,058

STRIP FEEDING DEVICE Filed Nov. 13, 1951 8 Sheets-Sheet 5 INVENTOR JOHN A. saw/0r ATTO n 9, 1956 J. A. SCHMIDT STRIP FEEDING DEVICE 8 Sheets-Sheet 6 Filed NOV. 13, 1951 INVENTOR JOHN A. SCHMIDT jmbw vm ATTO NEY June 19, 1956 J. A. SCHMIDT STRIP FEEDING DEVICE 8 Sheets-Sheet 7 Filed Nov. 15, 1951 T w W R WW W m o M W 1N m1 w J3 B June 19, 1956 J. A. SCHMIDT STRIP FEEDING DEVICE s Sheets-Sheet s Filed NOV. 15, 1951 INVENTOR JOHN A. SCHMIDT 3 mm XTTO NEY STRIP FEEDING DEVICE John A. Schmidt, Dayton, Ohio, assignor to The Standard Register Company, Dayton, Ohio, a corporation of Ohio Application November 13, 1951, Serial No. 256,072

16 Claims. (Cl. 197-128) This invention relates to strip feeding devices, and more particularly to apparatus providing for the imprinting of record entries on dual record strips advanced differentially past a recording position.

In some classes of record making work it is desirable to make journal entries in successive business forms comprised in a record strip, and to duplicate one line from each form on another strip, the latter providing a condensed summary of the data entered on the first strip. This has heretofore been done by making separate entries on the separate record strips. The instant invention proposes to obviate the need for making separate, duplicate entries by arranging the summary strip to pass recording position in conjunction with the journal strip but at a different rate of progression, with means being provided for selectively permitting and preventing the matter recorded on the journal strip being transmitted to the summary strip.

The object of the invention is to simplify the construction as well as the means and mode of operation of strip feeding devices, whereby such devices may not only be economically manufactured, but will be more efficient in use, adaptable to a wide range of applications, having relatively few parts, and be unlikely to get out of repair.

A further object of the invention is to provide a strip feeding device characterized as above described.

A further object of the invention is to provide means for such record making in a typewriter or like machine A further object of the invention is to provide for simplified adaptation of a typewriting or like machine in accordance with the instant invention, the apparatus of the invention being adapted for substantially unitary mounting on the typewriter carriage.

Still another object of the invention is to accomplish selective imprinting upon the summary strip through'use of an auxiliary platen, selectively interposed in front of the main platen roll.

A still further object of the invention is to provide for automatic advance of the journal strip to the exclusion of the summary strip and further to provide for advancement of the summary strip with the journal strip during intervals of withdrawal of the auxiliary platen.

A still further object of the invention is to provide manually operable eject mechanism effective to advance the journal strip one full form length, or the balance of a form length, independently of the automatic strip feed means, said eject mechanism further being effective to control the movements of the auxiliary platen.

A further object of the invention is to provide a strip feeding device possessing the advantageous structural features, the inherent meritorious characteristics and the mode of operation herein mentioned.

With the above primary and other incidental objects in view as will more fully appear in the specification, the invention intended to be protected by Letters Patent consists of the features of construction, the parts and combinations thereof, and the mode of operation, as herenited States Patent ice inafter described or illustrated in the accompanying drawings, or their equivalents.

Referring to the drawings, wherein is found the preferred but obviously not necessarily the only form of embodiment of the invention,

Fig. 1 is a top plan view of apparatus in accordance with the instant invention installed on a typewriter carriage;

Fig. 2 is a view like Fig. 1 but in front elevation and with carriage and typewriter elements omitted;

Fig. 3 is a view in side elevation of the apparatus of Fig. 2;

Fig. 4 is a view in cross section taken substantially along the line 44 of Fig. 2, including some elements of the carriage mechanism and omitting some elements appearing beyond the line 55;

Figs. 5, 6 and 7 are views similar to Fig. 4, taken substantially along the respective lines 5-5, 6--6 and 7--7 of Fig. 2;

Fig. 8 is a view like Fig. 3 but enlarged and with some portions broken away;

Fig. 9 is a detail view, in longitudinal section, of the variable drive for the main platen roll shaft;

Fig. 10 is a detail view in longitudinal section, taken substantially along the line 1010 of Fig. 7;

Fig. 11 is a detail view in longitudinal section, taken substantially along the line 1111 of Fig. 7;

Fig. 12 is a detail view in side elevation of pawl and ratchet means for advancing the record strips;

Fig. 13 is a detail view of one of the typewriter carriage end plates;

Fig. 14 is an enlarged view of a portion of Fig. 3, with some parts omitted or broken away;

Fig. 15 is a detail view in longitudinal section, taken substantially along the line 15-15 of Fig. 3;

Figs. 16 and 17 are positioned views of the eject mechanism, as seen in Fig. 3; and

Fig. 18 is a view in perspective of the auxiliary platen and associated controls.

I Like parts are indicated by similar characters of reference throughout the several views.

The invention is disclosed as embodied in a typewriting machine of a known kind. The machine is not illustrated, except for elements of the carriage which are in supporting or coacting relation with elements of the assembly of the invention, Jl'liCh assembly is mounted on the carriage as a superstructure.

Thus the carriage includes end plates 21 and 22 (Figs. 1, 3 and 4) held in rigid, spaced relation by tie members, such as the rods 23, 24 and 25, and by a trolley 26. Relatively stationary tracks 27 (Fig. 5) engage the trolley 26 and support the carriage for lateral sliding motion, as viewed in Fig. 1. In side by side, adjacent relation to each end plate 21 and 22 is a bearing plate 28. As seen in Fig. 5, each plate 21 and 22 has a pair of spaced apart studs 29 received in slots 31 in the adjacent plate 28. Thus the plates 28 may shift relatively to the end plates 21 and 22 in rearwardly and forwardly directions, and at the same time are a part of the carriage, partaking of its lateral movements on the tracks 27. Eflecting movement of the bearing plates 28 are cams 32 on a shaft 33, working in slots 34 in the respective bearing plates. The ends of the shaft 33 pass through oversize openings 35 in the end plates 21 and 22 and are journaled in respective arm supports 36 (see Fig. 8) on the end plates. The supports 36 are adjustable on the end plates whereby variations in the initial adjustment of the bearing plates 28 may be made.

The bearing plates 28 have cut out portions 37 (Fig. 5,) in their upper edges, receiving bushings 38' of the platen assembly which includes a sleeve 38 mounting a main platen roll 39. Cooperable with th'e'platen roll as indicated in Fig. 6, are type bars 41 arranged to make an impression upon a record strip passed over the platen roll. In the machine of the instant disclosure the bars 41 have a substantially fixed travel. Adjustment of the platen roll to and fro relative to the limit of travel of the type bars is provided for through adjustment of the bearing plates 28. It will be understood that such adjustment is made in the interests of obtaining a uniform impression on the record strip irrespective of the thickness of the strip. Adjustment of the bearing plates 28 may be accomplished manually by a lever 42 fixed to the shaft 33, and in accordance with a feature of the present invention, also is effected automatically in a manner to be described.

The platen assembly, of which the roll 39 is a part, is one of the class known as pin feed platens, character ized by pin wheel devices for feeding or advancing a record strip. In general, the roll 39 is mounted on pin Wheel bodies 43 (Fig. 11) keyed to the sleeve 38 and carrying radially reciprocable pins 44. Reciprocation of the pins is effected by rotation of the pin wheel body, carrying the pins relatively to an internal control cam (not shown) as disclosed in Metzner Patent No. 2,368,674, dated February 6, 1945, for Sectional Platen. Such cam is integral with a disc 45 (Fig. 6) supported on the hub of the pin wheel body 43 and adjustably fixed to a segmental plate 46 also supported on the hub of body 43. The plate 46 is notched for alternate positions of engagement with a pawl 47 so that adjustments of the plate 46 will also adjust the disc 45 whereby to re position the control cam for a change in the circumferential area of projection of the pins 44 from the body 43. A forked member 48, carrying pawl 47, engages a cross rod 49 in the framework of the carriage and is held thereby from rotation with the platen roll. As seen in Fig. 9, the ends of the platen sleeve 3% are counterbored to receive a bushing 51 through which projects a shaft 52, extending through and beyond the ends of the sleeve 38. By means of press fits, staking or the like, the sleeve 38 and shaft 52 are interconnected through the bushings 51 for rotary motion as a unit. One end of the shaft 52 passes through a sleeve extension 53 to a variable unit 54.

Briefly, the unit 54 includes a body 55 staked to the shaft 52, a peripherally notched disc -5 made fast on the sleeve 53 and a disc assembly 57 secured to the hub of body 55 and carrying one or more plungers 58. The plungers 58 are urged by springs 59 to engage notches in the disc 58, the relationship of notches and plungers being predetermined so that a plunger 58 may drop into a notch in disc 56 after each slight increment of relative rotary movement. By reason of the plungers 5S and disc 56 interconnecting the sleeve extension 53 and the shaft 52, the rotation of a ratchet wheel 61, keyed to the sleeve 53, is enabled to drive the shaft 52 and sleeve 38 thereon, acting through the disc 56, plungers 58, disc assembly 57 and body 55. A housing 62 surmounts the body 55 and is keyed thereto for unison rotary and relative axial movements. Such housing may be manually grasped, shifted axially, and turned to rotate shaft 52 and the platen roll assembly independently of sleeve 53 and ratchet 61, the axial motion of the housing being utilized to disengage the plungers 58 from the disc 56.

The ratchet 61 is held in its adjusted rotary positions by a detent s3 (Figs. 7 and 11). It is actuated for step by step rotary movement by a pawl 64 (see also Fig. 12) pivotally mounted on an actuating slide 65 and spring urged toward cooperative engagement with the ratchet 61. At its lower end the slide 65 has a pinin-slot connection with a pair of studs 66 carried by one of the bearing plates 2% and further is formed with a foot 67 cooperable in a manner not here shown with a spring urging the slide upward to the position of Fig. 7 and with operating means whereby once during each reciprocation of the carriage the slide is depressed to the position of Fig. 12. Apparatus thus is provided for advancing the ratchet wheel 61, and the platen roll to which it is connected, an increment of movement once for each reciprocating movement of the carriage.

In accordance with the dual feed principle of the instant invention, the motion of actuating slide 65 also is utilized to advance a second, overhead feed mechanism including a ratchet 68. The upper end of the slide 65 has a pin-in-slot connection with a stud 69 set in an intermediate frame member 71 (Figs. 1 and 10). The member 71 is attached to a cross rod 72 extending between side frames 73 and 74 of the aforementioned superstructure, the side frames 73 and 74 being respectively secured to the end plates 21 and 22 of the carriage. A stud 75 is set in the side frame 73 and aids in holding the frame member 71 rigid. A pawl 76, similar to the pawl 64, is on the upper end of the slide 65 and cooperates with the ratchet 68 to advance such ratchet and the as sembly of which it is a part, an increment of motion upon each actuating movement of the carriage operated slide.

The ratchet Wheel 68 is secured to a sleeve 77 (Fig. 10) on a shaft 78, the shaft 78 being journaled between the side frames 73 and 74 and operatively connected to the sleeve 77 through a variable 79 similar to the variable 54. Thus, the sleeve 77 has tang in engagement with a body element 81 of the variable, such body element being alternatively engaged and disengaged through plungers 82 and a disc 83 with the shaft 78. The construction and arrangement is such as to provide normally for motion of the shaft 78 with the sleeve 77 and ratchet 68 but to permit independent, manual rotation of the shaft for adjustment purposes, such adjustment being effected by a housing 84 surmounting body 81 and keyed to the shaft 78.

The shaft 78 has adjustably secured to it a pair of pin wheels 85 carrying fixed radial pins 86. Pivotaily mounted on the shaft 78, alongside each pin wheel 85, is a plate member 87 having forked engagement with the cross rod 72. The lower edge of the member 87 has a flange 88 extending in protective relation to the pins 86 on the underside of the pin wheels. Adjacent to the upper edge of each plate member 87 is a strip guide element 89 and a hold down finger 91, the latter being resiliently urged by a spring 92 into a position maintaininga strip in engagement with the pins 36 of the pin wheel.

The extent of advance of the ratchet wheel 68 and pin wheel shaft 78, under the actuation of slide 65, is controlled by a shield member 93 adjustably secured to a detent plate 94. The assembly comprising the member 93 and plate 94 is rotatably mounted alongside the ratchet 68 on a bearing 95 on the sleeve 77. The plate 94 has a plurality of notches 96 on its lower edge selectively engaged by a detent roller 97 in accordance with the position of oscillatory adjustment of the plate. A turned over flange 98 on the member 93 overlies a portion of the teeth on ratchet 68. By adjustment of the detent member 93, the pawl 76 may be held out of engagement with the teeth of ratchet 68 during a greater or lesser part of the travel of the pawl. The extent of movement of the ratchet thus may be controlled for purposes of variation in line spacing. A stop member 99 is mounted on the intermediate frame member 71 and wedges the pawl 76 into contact with the ratchet periphery at the end of the downward stroke of the actuating slide 65 to prevent overthrow of the ratchet.

An auxiliary platen 1101 (Figs. 1, 2, 4 and 6) is arranged to be selectively interposed in recording position to intercept the imprinting blows of the type bars 41. The element 101 is arcuate in shape and extends in substantially underlying relation to the platen roll 39 over the full length thereof. The major part of the auxiliary platen is in adjacent concentric relation to the roll 39. At its ends it is integrally or otherwise rigidly connected to plate elements 102 and 103 secured to respective hubs 104 and 105 pivotally mounted on the platen sleeve 38. The auxiliary platen accordingly is arranged for rocking S. motion on the sleeve 38 between alternate positions as represented by those illustrated in Figs. 4 and 6. Thus in Fig. 4 the auxiliary platen is withdrawn from recording position and the type bars 41' are free to move toward contact with the platen roll 39. In Fig. 6, the platen has been shifted in a counterclockwise direction into a position to receive the blows of the type bars to the exclusion of the main platen roll 39. The hub 104 of the one plate element 102 is engaged by tangs on the hub of an arm 106 connected by a link 107 with the previously mentioned lever 42. The latter, as heretofore described, is effective to rock the shaft 33 and thereby to shift the platen roll 39 to and fro relative to the limit of travel of the type bars. According to the present construction and arrangement of parts, therefore, the movement of the auxiliary platen 101 into and out of recording position is accompanied by a simultaneous movement of the main platen roll 39 providing respectively greater and lesser clearance between the roll 39 and the type bars 41.

The hub 105 of the other plate element 103 is made fast to the hub of a ratchet wheel 108. The assembly of parts comprising ratchet 108, hub 105 and plate 103 is mounted for free rotary motion relative to sleeve 38 subject to control of detent 63 but axial motion relative thereto is denied by collars 109 and 111 pinned to the sleeve.

The ratchet wheel 108 is positioned alongside the ratchet wheel 61. The pawl 64, operating upon the ratchet 61, is sufliciently broad to engage both ratchets 61 and 108. At the same time, therefore, that the ratchet 61 is advanced to turn the platen roll 39, the ratchet wheel 108 also is advanced, turning the auxiliary platen 101 in a direction to move it into the recording position of Fig. 6.

The engagement of the pawl 64 with the ratchets 61 and 108 is controlled by a lock-out device in the form of a plate 112 (see Figs. 7, 11 and '12) having a flanged shield portion 113. The plate 112 is adjustably secured to the side of the ratchet wheel 108 with the shield portion 113 extending between the teeth of the ratchets and the pawl 64. Considering again that the assembly of parts including the ratchet 108 and auxiliary platen 101 has motion between the limits as represented in Figs. 4 and 6, the position of the plate 112 in the limit shown in Fig. 6 may be seen in Figs. 7 and 12. In this position of the parts, wherein the platen 101 is in recording position, the portion 112 shields the teeth of the ratchets over substantially the full travel of the pawl 64, and, as a result, an actuation of the pawl carrying slide 65 is without eifect uponeither ratchet 61 or 108. The upper extreme position of the slide 65 is shown in Fig. 7the lower in Fig. 12. When the auxiliary platen 101 is withdrawn from recording position, the plate 112 is correspondingly moved in a counterclockwise direction and so enables the pawl 64 to engage and turn the ratchets 61 and 108 upon the next actuating movement of the slide 65. This action, as described, advances the platen roll 39 one increment of movement and returns the auxiliary platen to recording position.

The movement of the platen 101 from recording position is effected manually. The side plate 103 on the platen 101 has an upward arm extension 114 to which is attached a bracket 115. Bearing on the bracket 115 is a roller on a stud 116. The stud 116 is adjustably secured to an arm 117, the hub of which is secured to a shaft 118. The shaft 118 is rotatably mounted in mating, interengaged bearing bushings 119 and 121 (Fig. 15) which are in turn rotatable in an open ended sleeve 122 fixed to a supplemental frame piece 123 fastened to the side frame 73. The bushing 119 has a press fit engagement with a gear 124 meshed with a gear 125 on the aforementioned sleeve 77. The bushing 121 extends through the frame piece 123 and terminates in a plate 126 having a plurality of upstanding lugs 127 on its periphery. A manually operable eject lever 128 has a press fit on the hub of a cam 129 which is pinned to the shaft 118. The lever 128 carries a pawl 131 spring urged into engagement with the lugs 127 on the plate 126. In response to a rocking'motion of the lever 128, therefore, the shaft 118 is turned by cam 129 and the plate 126 is turned by pawl 131 acting on lugs 127. The shaft 118 is effective, through the arm 117 and stud 116 to actuate the integral assembly of parts comprising bracket 115, arm 114, side plate 103 and auxiliary platen 101. The plate 126 is effective through the bearing bushings 119 and 121 to turn the gear 124 and the gear and through the latter the train of mechanism leading to the upper pin wheels 85. A spring 132 (Fig. 3) normally holds the lever 128 retracted upon a stop 133.

A supplemental lever 134 is pivotally mounted on the lever 128 and engages a stud 135 on the pawl 131 and extends through a slot 136 in the lever 128. The return of the lever 128 to a position on stop 133 serves to rock the supplemental lever 134 in a direction to move the pawl 131 out of the path of the lugs 127. The pin Wheels 85 and the feed mechanism therefor accordingly may be back spaced when necessary. The initial movement of the lever 128, in a clockwise direction, allows the pawl 131 to resume cooperative relation with the lugs 127. A pawl 137 has a pivotal mounting on an adjustable fulcrum 138 on the frame piece 123 and is urged by a spring 139 to an interposed position with respect to the lugs 127 on the plate 126. The cam 129 acts on a lug 141 on the pawl 137 to normally hold the pawl upward out of cooperative relation with the lugs 127. Upon actuation of the lever 128, however, the cam 129 allows the pawl 137 to drop downward upon the plate 126 where it is engaged by a lug 127 to define a limit of travel for the plate 126 and thereby for the pin wheels 85.

The lever 128 thus constitutes a means for shifting the auxiliary platen 101 out of recording position and also a means for advancing the pin wheels 85 through a distance determined by the spacing between the lugs 127. These operations take place at the same time in response to rocking of the lever 128 in a clockwise direction, as viewed in Fig. 3. Return of the lever to rest position is accomplished by the spring 132 and is independent of the pin wheels 85 and auxiliary platen 101 which remain in adjusted position by reason of the indirect connections respectively represented by the pawl 131 and stud 116.

The apparatus makes record entries on a pair of record strips 142 and 143. As indicated in Figs. 4 and 6 the strip 142 is guided by a pair of brackets 144 on a cross rod 145 onto a paper table 146 from whence it passes between a paper pan 147 and the auxiliary platen 101. The strip 142 thus is on the outside of the platen 101. Passing over and beyond the auxiliary platen 101 through recording position in front of roll 39, the strip 142 extends upward and over the pin wheels 85, the strip having a continuous series of perforations (Fig. l) with which the pins 86 have driving engagement. Advanced by rotation of the pin wheels 85, the strip 142 passes over the cross rod '72 and out of the machine.

The strip 142 is held tensioned by a bail assembly 148 pivotally mounted on the shaft 78. Rearwardly extending arms 149 on the bail assembly are cooperative with rotatably adjustable cams 151 on the cross rod 72 whereby to impose a positive limit to the gravity induced pressure exerted by the bail assembly upon the strip 142. The aforementioned paper table may be adjusted upward and downward by the positioning of'a pair of arms 152 to cause the strip 142 to conform more closely to the curvature of the auxiliary platen 101.

The strip 143 is guided by a pair of brackets 153 on cross rods 154 and 155 into the space between the main platen roll 39 and the auxiliary platen 101. Marginal perforations in the strip are operatively engaged with the pin wheels 43, and, beyond the pin wheels, the strip is guided out of the machine over thecross rod 154. Tensioning of the strip 143 is eifected by a pair of rollers 156 carried by arms 157 fast on the rod 49. A limit of tensioning movement is set by abutments 158 on the rod 49 engageable with stops 159 on cover members 161 and 162' (Fig. 1) which enclose the end plates of the typewriter carriage.

A detailed explanation of the operation of the recording apparatus is thought to be unnecessary in view of the foregoing particular description of the construction and arrangement of parts. In general, however, it may be pointed out that the strip 142, which may be termed the journal strip, is advanced one increment of motion upon each carriage shift. The auxiliary platen 1111 being normally in the position of Fig. 6, the type impressions made by the type bars 41 are made on the strip 142 to the exclusion of the strip 143. The latter remains stationary by reason of the position of the shield member 112 warding off contact of the teeth on ratchets 61 and 168 by pawl 64. When the desired or required number of entries have been made in a form length in the strip 142, the eject lever 128 is actuated. This action turns the shaft 118 to retract or withdraw the platen 101 from recording position, and simultaneously therewith the platen 39 is moved closer to the limit of travel of the type bars. At the same time movement of eject lever 128 operates the pin wheels 85 to advance the strip 142 quickly the extent necessary to bring the first line of the next succeeding form into recording position. It will be understood in this connection that the plate 126 will already have advanced part of the distance through a form length because of the regular carriage initiated movements of the slide 65. In actuating the lever 128, pawl 131 catches up to a lug 127 during a first phase of movement and during the second phase'the lever and plate 126 move together until positively arrested by the stop 137.

The retraction of auxiliary platen 101 is also efiective to move the member 112 out of shielding position with respect to ratchets 61 and 108. Thus the parts are now positioned to allow the type bars to travel their full extent for engagement with the platen roll 39 and consequent imprinting upon both strips 142 and 143. The parts are further positioned to allow the platen roll 39 and pin wheels 43 to be advanced an increment of motion in synchronism with the next advance of the upper pin wheels 85. A new line of the strip 143 thus is presented in recording position. In accompaniment with such advance, however, the shield member 112 is returned to shielding position and further advance of the platen 39 is precluded until the next actuation of the eject lever 128. At the same time member 112 is returned to shielding position, the platen 39 is moved away from the type bars and the auxiliary platen 1191 is restored to the recording position in the path of the type bars 41 so that no further imprinting may take place upon the strip 143 until the next actuation of lever 128.

It will be understood that the extension arm 114 may be operated by hand independently of the eject lever 128 if it is desired to reproduce an entry on the strip 143 without a corresponding form length advance of the strip 142.

It will further be understood that the strips 142 and 143 may incorporate a plurality of record sheets and interleaved carbon transfer material, there being in any event transfer means between the respective strips so that an impression made on the overlying strip 142 may be transmitted to the underlying strip 143, when the platen 191 is out of recording position as in Fig. 4. Since the strip 142 is under tension upon withdrawal of the auxiliary platen 1121, the strip moves from the outer surface of the auxiliary platen to adjacent, tangential relationship with the surface of the roll 39, the strips 142 and 143 assuming in this position the character of a unitary strip assembly.

From the above description it will be apparent that there is thus provided a device of the character described possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible of modification in its form, proportions, detail construction and arrangement of parts without departing from the principle involved or sacrificing any of its advantages.

Wbiie in'order to comply with the statute the invention has been described in language more or less specific as to structural features, it is to be understood that the invention is not limited to the specific features shown, but that the means and construction herein disclosed comprise but one of several modes of putting the invention into effect.

Having thus described my invention, 1 claim:

1. In a typewriting or like machine, a platen roll, type bars arranged to move toward contact with said piaten roll along a writing line, said bars being limited in their movement toward said platen roll, said platen roll being movable toward and away from said type bars, an arcuate plate in approximately concentric relation to said platen roll and defining an auxiliary platen movable into and out of a position between said platen roll and said type bars at said writing line, and means for effecting conjoint synchronized movements of said platen roll and of said auxiliary platen.

2. In a typewriting or like machine wherein type bars have a relatively fixed limit of travel and a platen roll is movable closer to or more distant from the limit of travel of the type bars in an approximately planar motion, an arcuate plate in approximately concentric relation to said platen roll and defining an auxiliary platen movable into and out of a position to be contacted by the type bars in lieu of the platen roll, and means for efiecting conjoint and synchronized movements of said platen roll and of said auxiliary platen.

3. In a typewriting or like machine wherein type bars have a relatively fixed limit of travel and a platen roll is movable to and fro relative to the limit of travel of the type bars, an auxiliary platen movable into and out of a position to be contacted by the type bars in lieu of the platen roll, means for moving said auxiliary platen into said position, other means for moving said auxiliary platen out of said position, and means providing for a corresponding motion of said platen roll in accompaniment with the movements of said auxiliary platen.

4. Recording apparatus wherein dual record strips in adjacent superposed relation are fed past a recording position, piaten means interposed between said dual record strips at said recording position whereby the overlying record strip receives record entries to the exclusion of the underlying strip, means for withdrawing said platen means whereby the entry made on the overlying strip may be transmitted to the underlying strip, independent feeding devices for said strips, and means positioned by movement of said platen means to interposed position for preventing the operation of the feeding device associated with the underlying record strip in the interposed position of said platen means.

5. Recording apparatus according to claim 4, characterized by means operable by said withdrawing means for disabling said last named means.

6. Recording apparatus according to claim 4, characterized by means operable by said withdrawing means for disabling said preventing means, and means operable in response to actuation of the feeding device associated with the underlying record strip for re-enabling said preventing means.

7. In a typewriting or like machine having a reciprocable carriage and wherein dual record strips in adjacent superposed relation are fed past a recording position, platen means interposed between said dual record strips at said recording position whereby the overlying record strip receives record entries to the exclusion of the underlying strip, means for withdrawing said platen mean whereby the entry made on the overlying strip may be transmitted to the underlying strip, means operable upon each reciprocation of the carriage for advancing the overlying record strip an increment of motion and for tending to advance the underlying record strip an increment of motion, and means positioned by movement of said platen means to interposed position for controlling the action of said last named means to prevent advance of the underlying record strip thereby except when said platen means is withdrawn.

8. In a typewriting or like machine wherein dual record strips are fed differentially past a recording position and having a reciprocable carriage, feeding means for each of said record strips, means operable upon each reciprocation of said carriage tending to impart an increment of movement to each of said feeding means, a lockout device selectively interposed between said last named means and one of said feeding means to prevent actuation of said one feeding means, and a platen element movable into and out of recording position, said lockout device being attached to said platen element for movement into and out of interposed position in conjunction with the movements of said platen element.

9. A typewriting or like machine according to claim 8, characterized in that said lockout device is attached to said platen element for movement into and out of interposed position in correspondence with movement of said platen element into and out of recording position.

10. In a typewriting or like machine, a platen roll, a ratchet in driving relation to said platen roll, a pawl urged to engagement with said ratchet, a machine reciprocated member carrying said pawl, said platen roll having an intermittent step by step rotary movement in response to rotation of said member, an auxiliary platen member movable into and out of shielding relation to said platen roll, and a lockout device on said auxiliary platen member movable into and out of an interposed position between said pawl and ratchet in response to the movements of said auxiliary platen member.

11. In a typewriting or like machine wherein dual record strips in superposed relation are fed differentially past a recording position, separate feeding devices for said strips each including a pawl and ratchet mechanism, a machine reciprocated member providing a common mounting for said pawls and operating through said pawls to advance said feeding devices in step by step fashion, a platen roll in said recording position in underlying relation to both of said strips, an auxiliary platen member between said strips and adjustable into and out of said recording position, and a lockout device operated by said platen member rendering ineffective the pawl and ratchet mechanism associated with the strip in underlying relation to said platen member when said platen member is in recording position.

12. In a typewriting or like machine wherein dual record strips in superposed relation are fed differentially past a recording position, a platen roll assembly in recording position, an auxiliary platen element between said strips and pivotally mounted on said assembly for swinging motion into and out of recording position, a feed lockout member fixed to said platen element and moved unitarily therewith, separate feeding devices for said record strips, the feeding device for the underlying one of said strips being engaged by and rendered ineffective by said lockout member when said platen element is in recording position, and machine operated means for actuating said feeding devices.

13. In a typewriting or like machine having a recording position, a platen roll assembly including a platen roll in recording position, an auxiliary platen member pivotally connected to said assembly for motion to and from recording position in shielding relation to said platen roll, a machine operated pawl and ratchet mechanism for step feeding said platen roll, and a part on said platen member holding the pawl of said pawl and ratchet mecha nism in ineffective position when said platen member is in recording position and releasing said pawl for feeding operation when said platen member moves out of recording position.

14. A typewriting or like machine according to claim 13, characterized by means for moving said platen member into recording position responsive to a predetermined number of feeding operations of said pawl and ratchet mechanism.

15. In a typewriting or like machine wherein dual record strips are fed differentially past a record position and having a reciprocable carriage, feeding means for each of said record strips, means operable upon each reciprocation of said carriage tending to impart an increment of movement to each of said feeding means upon each reciprocation of said carriage, a lockout device selectively interposed between said last named means and one of said feeding means to prevent actuation of said one feeding means, said lockout device having alternately effective and ineffective positions, manual means for moving said device to one position, and means operable in response to advance of said one feeding means for moving said device to the other position.

16. In a typewriting or like machine wherein dual record strips are fed ditferentially past a record position and having a reciprocable carriage, feeding means for each of said record strips, means operable upon each reciprocation of said carriage tending to impart an increment of movement to each of said feeding means, eject means for imparting another increment of movement to one of said feeding means, a lockout device selectively interposed between said operable means and the other one of said feeding means for preventing actuation of said other feeding means, and means operable by said eject means for disabling said lockout device.

References Cited in the file of this patent UNITED STATES PATENTS 1,216,251 Brown Feb. 13, 1917 1,273,010 Smith July 16, 1918 1,350,681 Stickney et a1 Aug. 24, 1920 1,390,955 Hausman Sept. 13, 1921 1,451,423 Handley Apr. 10, 1923 1,509,228 Carino Sept. 23, 1924 1,935,677 Terry et a1. Nov. 21, 1933 1,957,203 Eichenauer May 1, 1934 2,392,838 Davidson Jan. 15, 1946 

